If you drag-drop a student (or students) from another window into the Attendance Window, but no valid class time was selected, then the Attendance Selection Window is displayed.
This is a prompt to determine which class for which you were intending to attend the student (or students).
If you Cancel this window, then no attendance is recorded. If you choose OK, or double-click a class time, then the student(s) you dropped on the window are attended to that selected class and that class day and time is then selected in the window.
